Fluid assisted drill construction

ABSTRACT

A deep hole drill construction having a pointbody, the shank of the drill consisting of a tubular shaft, the open end of which communicates with relieved areas on said pointbody through which coolant may be pumped by either forcing it down into the tube and evacuating it up through the annulus generated between the hole and the drill shank or by pumping it thorugh said annulus and evacuating it through the tube or drill shank to both facilitate swarf removal and cooling of the pointbody.

[ Oct. 23, 1973 United States Patent [1 1 Burks FLUID ASSISTED DRILLCONSTRUCTION Primary Examiner-Francis S. Husar ltt St Att0rney-Fidelman,Wolffe & L im Inventor: Daniel S. Burks, l 35ll Bart [22] Filed:

[57] ABSTRACT A deep hole drill construction having a pointbody, the

[ PP 91052141043 shank of the drill consisting of a tubular shaft, theopen end of which communicates with relieved areas b 36 m 8 who "N4 mmhc 0.! u ua c h s I new l mm .w UmF ]l 2 8 555 [II on said pointbodythrough which coolant may be pumped by either forcing it down into thetube and evacuating it up through the annulus generated between the holeand the drill shank or by pumping it thorugh said annulus and evacuatingit through the [56] References Cited UNITED STATES PATENTS tube or drillshank to both facilitate swarf removal and cooling of the pointbody.

2,610,529 9/1952 AtkinS0n............................... 408/593,191,463 6/1965 Ladendorf............................ 408/59 28 Claims,7 Drawing Figures FLUID ASSISTED DRILL CONSTRUCTION BACKGROUND OF THEINVENTION In industrial machining operations that require rapid metalremoval rates, moderate tolerances and seek deep holes (defined asgreater than one drill diameter) with minimum tool breakage,carbide-tipped oil-hole twist drills currently dominate the field. Adurable and relatively dependable performer in its own right, the oilhole twist drills versatility is notably increased by the addition ofcarbide cutting lips. The pentagonal carbide drill point insert iscommonly used for this purpose and lends attractive advantages in thatit is inexpensive. A variety of different carbide compositions areavailable for varying feeds and speeds as well as differing workmaterials, and it can be readily replaced or reground thereby extendingtool life indefinitely.

Tht twist drill, however, includes some distinct advantages yet to beovercome. Oil-hole twist drills of extended length are quite expensiveto fabricate and prone to shank fracture. Deep hole drilling normallyrequires a machining practice commonly known as wood-peckering. In thisapplication, since drill wear is substantially increased and swarf jamstend to become more frequent, the drill must be regularly removed fromthe workpiece during the cut to reduce the potential of jamming and tocool the cutting lips. This practice quite naturally reduces efficiency,and in transfer station operations, multiplies capital machining costs.The greatest disadvantage, however, in high speed machining applicationsof the twist drill, resides in the tools susceptibility to chattervibration. The twist drills propensity to vibrate, or chatter, atmachine induced or self-excited frequencies is an inherentcharacteristic of its structure. A deleterious mechanism in its ownright, in applications using carbide cutting lips, the chatter vibrationphenomena rapidly produces catastrophic failure of the drill point andattendant drill shank failure in the following manner:

The helical configuration of the twist drill lands and depth of itsflutes conspire to notably reduce the torsional shearing strength of thedrill shank and significantly reduces its natural vibratory frequency.At high feeds and speeds the drill lands tend to function as a helicalspring and when a natural or harmonic frequency is attained, the landswrap and unwrap (load and unload) in an amplified fashion whichtranslates into axial motion and displacement, and beats the cuttinglips, at high frequency, upon the bottom of the blind hole. Whilecarbide remains an excellent cutting material due to its high hardnessproperties, it is, nevertheless, extremely brittle and rapidly fails ina catastrophic fashion in this environment.

, Basic mechanics teaches that in structural members I subjected totorsional loading, maximum resistance resides in the material or fiberTat the greatest distance from the axis of twist, those fibers layingalong the axis of.the twist offering zero resistance to such a load.Moreover, any departure in structure from a perfectly round crosssection will impose varying degrees of warp (axial displacement in theoutermost fibers) when subjected to torsional loads. Of profoundsignificance to this invention is the structural resistance to torsionaldeflection (commonly defined in the discipline of Applied Mechanics bythe Polar Moment oflnertia J) increases as a function of the fourthpower of increasing, radius and circular cross section; and thatclassically, the strongest and most economical structure for appliedtorsional loads remains the hollow circular shaft.

Therefore, it is an object of this invention to provide a drillconstruction that will avoid the above identified structuraldeficiencies of the carbide-tipped oil hold twist drill.

It is a further object of this invention to provide a drill constructionthat will provide an unobstructed high pressure, high volume coolantflow rate to rapidly remove swarf, lubricate bearing surfaces and coolcutting surfaces.

It is another object of this invention to provide a drill structure thatwill permit the interchangeable use of an inner diameter flush forimproved surface finish and redueed swarf jams or an outer diameterannulus flush, as currently employed in most production machiningoperations as a rapid and effective swarf removal expeclient.

A further object of this invention is to provide a drill structure thatwill accommodate multiple cutting lips and the increased machiningaccuracy inherent to this design.

A still further object of this invention is to provide a drill structurethat will provide the option of full journal bearing support at thedrill point and increased machining accuracy.

Furthermore, it is an object of this invention to provide a drillstructure that will insure maximum support and acceptable relief for thecutting lips and the chisel point.

A further object of this invention is to provide an improved solidcarbide cutting tip to be used in conjunction with a tubular shank.

DESCRIPTION OF THE INVENTION These and other objects of the inventionwill become apparent from reading the following specification anddescription of a preferred embodiment depicted in the drawings which isintended to illustrate, but not to restrict, the scope of the invention.

FIG. 1' is a fragmentary side elevation illustrating the drill mountedin a drilling or boring machine spindle equipped for continuous highpressure coolant supply. Two forms of coolant supply are depicted,though it is understood that both could not be used simultaneously;

FIG. 2 is an enlarged fragmentary side elevation of the cutting end ordrill point of a first embodiment of the drill; I I

FIG. 3 is an end view of the first drill point embodiment as projectedfrom FIG. 2; t

FIG. 4 is a sectional view of the drill point taken along the line 4-4from FIG. 2, detailing the construction of the first embodiment;

FIG. 5 is an enlarged fragmentary side elevation of the cutting end ordrill point of a second embodiment of the drill;

FIG. 6 is an end view of the second drill point embodiment as projectedfrom FIG. 5;

FIG. 7 is a sectional view of the drill point taken along the line 7--7from FIG. 5 detailing the construction of the second embodiment.

Referring now to FIG. 1, drill l0 embodying the principle of theinvention is shown mounted in spindle I4 penetrating workpiece 21 shownin sectional view. In this Figure, two modes of coolant supply aredepicted, though it is immediately obvious that both modes could not beused simultaneously. Since it is an object of this invention to providea drill construction that will permit the interchangeable utilization ofhigh pressure, high volume coolant suppled through either the innerdiameter (OD FLUSH Mode l), or over the outer diameter (ID FLUSH Mode 2)both modes will be described now separately.

MODE 1 ID COOLANT SOURCE The drill is intended for either generalpurpose or specialized use in drilling machines or boring machines thatclamp the work rigid and rotate the drill, or it may be used with equaleffectiveness in machines which mount the drill in a stationary spindlewhile the work is rotated and fed relative to the drill. In theembodiment described in this mode, where the coolant is to be pumpedthrough the spindle and drill to the drill point, workpiece interfaceand exhausted through the annulus created by the drills outer diameterand the holes inner diameter, spindle 14 represents either the rotatingspindle of a drilling machine or the stationary spindle of a machinesuch as the turret lathe.

The shank 27 of the drill is secured to the spindle 14 by collet andchuck arrangement 13, a commercially available structure. Swivel joint15 represents another commercially available structure for supplying orexhausting coolant from the axial coolant bore 12 of the drill, and forthis reason is not depicted in detail. As indicated in the diagram ofFIG. 1, to operate the capacity of Mode 1, coolant is pumped from areservoir (not shown) by a high pressure, high volume source anddelivered to the swivel joint conduit 16. The swivel joint 15 containsan internal annular chamber 17 surrounding spindle 14. The spindlecontains a lateral bore 18 communicating with chamber 17 and an axialbore 19 in the spindle such that the coolant entering conduit 16 isconducted to the spindle bore 19 under pressure. Collet and chuckarrangement 13 secures the drill firmly andaccurately in axial alignmentwith the spindle and provides a fluid tight connection so that thecoolant may flow without leakage from the lower end of the spindle bore19 to the upper end of the drill bore 12. It is understood that thechucking and coolant conduit means described above is selected todemonstrate the principles of one mode of utilization of this invention,and that the coolant is supplied through the spindle to the drill fordischarge at its cutting end whether the drill is rotated relative tothe work or vice versa as indicated above; nor should the specificcollet and swivel joint indicated be in any way considered limiting withrespect to the general use of the drill in this embodiment.

To further characterize the drills operation in Mode 1, it is readilyapparent that a guide bushing (similar to bushing 23) may or may not benecessary to assist drill alignment as the cut is initiated. In anyevent, in Mode 1 operation, it is immediately apparent that guidebushing 23 could not be used as diagrammed, since the restrictionimposed by bushing shoulder 28 and reduced inner diameter 29 wouldpositively block all effluent. A larger egress means would have to beprovided. (Use of guide bushing 23 will be explained in detail in Mode 2operation.) During the cut, colant is admitted to the blind hole throughthe expanded and outwardly tapering orifice at the drill point. At thispoint, the coolant performs three primary functions. Implemented by theunobstructed and broad diameter of the axial drill bore 12 and outwardlytapering orifice 20, any commonly used machining oil/coolant, oil baseor water soluble, can be supplied at both a high volume and highpressure:

1. To function as the sole swarf removal medium;

2. To effectively lubricate all cutting and bearing surfaces that existbetween the tool and workpiece; and

3. Owing to a sustained high volumetric flow rate, effectively cool bothdrill contact surfaces and the surrounding work medium. The coolant andentrained swarf are then collected by suitable means (not shown),separated (commonly, swarf is usually left to settle to the bottom of asump) and the coolant is then recirculated.

MODE 2 OD COOLANT SOURCE The purpose of this embodiment is to seek animproved surface finish in the workpiece by preventing the fines andswarf generated by the drilling operation from contacting the innersurfaces of the hole being machined. A further advantage is realized inthe fact that the tendency of chip-jams to occur in the machining ofextremely deep holes is reduced by exhausting the swarf through theinner diameter of the drill, or drill bore 12, and thus preventing theiraccumulation at bushing shoulders, in drill flutes or any of the othercommonly recognized flow restrictions that precipitate this event. It isimmediately apparent that this embodiment requires the utilization of asealed clamping arrangement similar to bushing 23 and eliminates the useof coolant supply conduits similar to swivel joint 15. Further requiredis that axial bore 19 in spindle 14 be extended to the spindles termius,as is currently the case in most trepanning operations where cuttingsare similarly exhausted through the spindle bore.

To characterize the drills operation in Mode 2 it is necessary to sealthe annular chamber 22 generated between the drill shank 27 and theholes inner diameter so that coolant supplied to the chamber underpressure will force all swarf and ships through drill point orifice 20and into drill bore 12, discharging them through the spindle bore. InFIG. 1, bushing 23 is first fit to the drill shank 27. The bushingsreduced diameter 29 provides sufficient clearance for rotational andaxial movement of the drill shank, but the gland created by 0-ring 25provides an effective high perssure coolant seal. The bushings lowerbore is of greater diameter and is designed to accommodate fullretraction of the drill point from the workpiece as well as guide thedrill during the initial penetration of thw work. The bushingmay beclamped or fastened against the work by a number of commerciallyavailable devices for this purpose. Means such as 0-ring 26 provide aneffective coolant seal between the bushing and the work. High pressure,high volume coolant is then supplied to the drill during its operationthrough bushing conduit 24 resulting in all effluent being dischargedupwardly and axially through the drill bore and spindle bore as statedabove. While the utilization of bushing 23 described in the embodimentof this mode of operation is not meant to restrict the scope of thedrills operation and should not therefore be considered as limiting, aneffective sealing device similar to bushing 23 must be used to createannular chamber 22 and a selection of them are commercially available.

Referring now to the elevations and cross-sectional views of the drillpoint where like numbers describe like characteristics of structure, itsversatile structure and fabrication technique will be explained.

FIG. 2 shows a fragmentary side elevation of the simple, general purposedrill point embodied in this invention. The drill point body 11 isfabricated as an intact and distinct unit and is normally constructed ofhigh speed steel, a sintered metal, or a durable oxide. While the body11 may be machined from drill rod, tool steel, or other suitable highhardness materials, recent advances in powdered metallurgy permitmolding, conse quently rendering carbide doubly attractive. The pointbody 11 is of greater diameter than the drill shank 27 and can bedetachably connected, glued by compounds such as epoxy resin, or brazed(51) to the shank as shown in FIG. 4. The drill shank 27 consists of anycommercially available tubing or prebored drill rod whose physical andmechanical properties include a structural rigidity and shear modulussufficient to sustain the axial and torsional loads to which the drillwill be subjected. Such loads are a function of the physical propertiesof the intended work as well as the feeds and speeds at which the toolwill be operated. Since one of the prime objects of the invention is toavoid the deleterious effects of self-excited chatter vibrations, whichhave been partially negated by the prerequisite construction of thetubular shank, natural frequencies of the material selected for shankconstruction should also be considered.

The drill point depicted in FIGS. 2-4 shows a general purpose point withan included angle of 1 18, Angle B; 0 or neutral back point taper, AngleD; 0 or neutral lip rake 32; a 45 chamber at the base of the drillpoint, A-ngle C; and a 30 axial relief at the drill point end of theshank bore 12, Angle A. None of the specifications, however, are to beconsidered fixedly prerequisite; all above-identified angles may varywithin acceptable limits to subscribe to attendant machining conditionsby one so skilled in the art. With the additional aid of FIGS. 3 and 4,other generalized features of the drill point include cutting lips 33,flank relief or land portions 31, chisel point 37, and drill pointorifice 20. Lower point body relief 34 is an optional expedient ifincreased coolant volumetric flow rates are desired. However, shouldhigh speeds and feeds require greater point rigidity, cutting lips mayretain a neutral lip rake 32 through the chamfer, and lower point bodyrelief 34 may be disregarded. Each flank'relief or land portion 31 hasrelieved or lip clearance sections, as at 31 and ajournal means 31having a bearing surface. The fabri-- cation of drill point orifice isextremely crucial to the success of this drill in its intendedapplication to either mode of operation. The geometry of the drill pointbody obtains from attempts to render the orifice 20 as large andunobstructed as possible without sacrificing the structuralcharacteristics necessary for the cutting lips to sustain maximumapplications of torsional stress and the chisel point to sustain theincreasing axial loads as a consequence of increasing lip wear. In thisrespect,

it has been found expedient to seat the drill shank.

below the base chamfer 35 of the point body and relieve the shank bore12 30" from the axis to render it more accessible. Similarly, theinternal bore of the drill body is extended in a conical configurationof 45, as at 20, beyond the shoulder that will seat the drill shank inorder to open the orifice in the maximum fashion permissible. Ingrinding or preforming conical orifice 20, it is essential thatsufficient body remain below the cones terminus to permit a moderateamount of regrinding so that acceptable tool life levels may berealized. Similarly, however, the extent of usable point body remainingbelow the cone's terminus should not be so great as to prevent theturbulence of the high pressure coolants efflux from, or entrance to,the orifice from coming in effective contact with the full breadth ofthe cutting lips. This will depend on the nature of the work to beperformed.

The distance from the furthermost point on the cutting end of said drillpoint body 11, i.e., at 37, to the relieved open areas adjacent theinnermost end of said bore is greater than one-third of the total lengthof the drill point body. The tubular shank has an outside diameterapproximately 40 to 60 percent of the width of said drill point bodymeans.

FIGS. 5 and 7 depict a variation of the general purpose drill pointavailable to this drill by virtue of its simple construction. Sinceflutes and lands have been eliminated as a result of the swarf removalcapacity of the high pressure coolant, the drill point is no longerconstrained to a specific number of cutting lips defined by a likenumber of flutes. In fact, multiple odd numbers of cutting lips lendthemselves to increasing feed rates and greater accuracy, thoughadmittedly fabrication and regrinding costs are increased in such pointbody construction. Furthermore, by virtue of reduced shank diameter,idealized journal bearing theory can be fully employed to increasedrilling accuracy and reduce land and lip wear, simultaneously improvingsurface finish. Specifically, FIG. 5 shows a drill point body 11 withthree cutting lips-33, equally spaced, a needle point 60, and a fulljournal encasing the lower portion of the point body. The journal may beattached to point body 11 by force fitting, epoxy resin, brazing, or anyconveniently available means. (It should be noted that of the journalhave been removed in FIG. 5, as defined by partial section 55 in FIG. 6,so that structural features of point body 11 will be less confusing.) Asstated above, like numbers define like characteristics of the previousdrill point embodiment. Again, a specific included point angle, pointbody back taper, point body chamfer and lip rake andrelief can be varieddepending on the nature of the work to be accomplished. It should beapparent that the utilization of chip breakers, negative rakes, or anyother common shop expedient can be utilized in the construction'of thissimple and unconstraining drill and drill point, and the two drill pointembodiments depicted in the drawings are not to be considered asrestricting in this respect.

While only two embodiments of the drill point have been shownand'described, it is obvious that many modifications will occur to thoseof ordinary skill in the art without departing from the scope of theappended claims.

What is claimed is:

1. An improved high speed deep hole drill, said drill comprising atubular shank having an inside diameter and an outside diameter, saiddiameters being respectively uniform throughout a substantial length ofsaid shank, a drill point body means having a length and width and abore therein, said bore extending a predetermined distance into saidpoint body means and receiving one end of said tubular shank, saidtubular shank being secured against movement within said bore, saidpoint body means having at least two cutting lips and accompanying flankrelief and lip rake portions, the arrangement being such that saidcutting lips are fully supported by said flank relief portions during adrilling operation, said flank relief portions having relieved sectionsand journal means, said combined journal means having a bearing surfacemeans of greater diameter than the outside diameter of said tubularshank, and adapted to provide bearing support for said drill inoperation, said drill point body means being relieved at the inner endof said bore so as to provide a plurality of open areas between the endof said tubular shank secured within said bore and said lip rakeportions, said open areas adapted to provide communication between saidtubular shank, said cutting lips and the tubular space between theoutside diameter of said tubular shank and the wall of the hole beingdrilled whereby coolant may be forced through the inside of said tubularshank to cool said drill point body means and said work and to flushchips produced by said drill out of said hole.

2. A drill as in claim 1 wherein said coolant is interchangeablysupplied through either said tubular space or said inside of saidtubular shank and exhausted through remaining regress means.

3. A drill as in claim 1 wherein said coolant is forced through saidtubular space or annulus between drill shank and hole and exhaustedthrough said inside of said tubular shank.

4. A drill as in claim 1 wherein said drill point body means is ofintegral construction.

5. A drill as in claim 1 wherein said bearing surface means completelysurrounds said drill point body means and is circular in configurationto provide full bearing support to said drill when it is in operation.

6. A drill as in claim 5 wherein said journal means comprises a ring ofmetal fixedly secured to said flank relief portions of said drill pointbody means.

7. A drill as in claim 1 wherein said drill body means is chamfered atits base, the chamfer areas extending from the juncture of said pointbody means with the external diameter of said tubular shank to an areaof said flank relief portions adjacent said journal means.

8. A drill as in claim 7 wherein portions of said chamfered areas arerelieved.

9. A drill as in claim 1 wherein said bore in said drill point bodymeans in countersunk at approximately 45 to provide said open areas tofacilitate coolant flow.

10. A drill as in claim 9 wherein the end of said tubular shank iscountersunk from about 12 to 30 from the axis of said shank to furtherfacilitate coolant flow in conjunction with said countersink in saiddrill point body means.

11. A drill as in claim 1 including a chisel point on said drill pointbody means, and wherein there are two cutting lips and accompanyingflank relief and lip rake portions on said drill point body means.

12. A drill as in claim 1 wherein there are at least three cutting lipswith accompanying flank relief and lip rake portions on said drill pointbody means and said drill point body means is of integral construction.

13. A drill as in claim 1 wherein said drill point body means isintegrally constructed of a sintered metal.

14. A drill as in claim 1 wherein said drill body means is integrallyconstructed of an oxide metal.

15. A drill as in claim 1 wherein the distance from the furthermostpoint on the cutting end of said drill point body means to said relievedopen areas adjacent the innermost end of said bore is greater thanone-third of the total length of said drill point body means.

16. A drill as in claim 1 wherein said tubular shank has an outsidediameter approximately 40 to percent of the width of said drill pointbody means.

17. An improved high speed deep hole drill body for use with a tubularshank, said drill body comprising a drill point body means having alength and width and a bore therein, said bore extending a predetermineddistance into said point body means and adapted to receive one end ofsaid tubular shank, said point body means having at least two cuttinglips and accompanying flank relief and lip rake portions, thearrangement being such that said cutting lips are fully supported bysaid flank relief portions having relieved sections and journal means,said combined journal means having a bearing surface means of greaterdiameter than the outside diameter of said tubular shank, and adapted toprovide bearing support for said drill in operation, said drill pointbody means being relieved at the inner end of said bore so as to providea plurality of open areas between the end ofa tubular shank receivedwithin said bore and said lip rake portions, said open areas adapted toprovide communication between a tubular shank, said cutting lips and thetubular space between the outside diameter of a tubular shank and thewall of the hole being drilled whereby coolant may be either forced downsaid tubular space or the inside of a tubular shank to cool said drillpoint body means and said work and to flush chips produced by said drillout of said hole.

18. A drill body as in claim 17 wherein said drill point body means isof integral construction.

19. A drill body as in claim 17 wherein said bearing surface meanscompletely surrounds said drill point body means and is circular inconfiguration to provide full bearing support to said drill when it isin operation.

20. A drill body as in claim 19 wherein said journal means comprises aring of metal fixedly secured to said flank relief portions of saiddrill point body means.

21. A drill body as in claim 17 wherein said drill body means ischamfered at its base, the chamfer areas extending from the juncture ofsaid point body means with the external diameter of a tubular shankadapted to be received therein to an area of said flank relief portionsadjacent said journal means.

22. A drill body as in claim 21 wherein portions of said chamfered areasare relieved.

23. A drill body as in claim 17 wherein said bore in said drill pointbody means is countersunk at approximately 45 to provide said open areasto facilitate coolant flow.

24. A drill body as in claim 17 including a chisel point on said drillpoint body means, and wherein there are two cutting lips andaccompanying flank relief and lip rake portions on said drill point bodymeans.

25. A drill body as in claim 17 wherein there are three cutting lipswithaccompanying flank relief and lip rake portions on said drill pointbody means and said drill point body means is of integral construction.

26. A drill body as in claim 17 wherein said drill point body means isintegrally constructed of a sintered metal.

27. A drill body as in claim 17 wherein the distance from thefurthermost point on the cutting end of said drill point body means tosaid relieved open areas adjacent the innermost end of said bore isgreater than onethird of the totallength of said drill point body means.

28. A drill body as in claim 17 wherein said bore has a diameterapproximately 40 to 60 percent of the width of said drill point bodymeans.

1. An improved high speed deep hole drill, said drill comprising atubular shank having an inside diameter and an outside diameter, saiddiameters being respectively uniform throughout a substantial length ofsaid shank, a drill point body means having a length and width and abore therein, said bore extending a predetermined distance into saidpoint body means and receiving one end of said tubular shank, saidtubular shank being secured against movement within said bore, saidpoint body means having at least two cutting lips and accompanying flankrelief and lip rake portions, the arrangement being such that saidcutting lips are fully supported by said flank relief portions during adrilling operation, said flank relief portions having relieved sectionsand journal means, said combined journal means having a bearing surfacemeans of greater diameter than the outside diameter of said tubularshank, and adapted to provide bearing support for said drill inoperation, said drill point body means being relieved at the inner endof said bore so as to provide a plurality of open areas between the endof said tubular shank secured within said bore and said lip rakeportions, said open areas adapted to provide communication between saidtubular shank, said cutting lips and the tubular space between theoutside diameter of said tubular shank and the wall of the hole beingdrilled whereby coolant may be forced through the inside of said tubularshank to cool said drill point body means and said work and to flushchips produced by said drill out of said hole.
 2. A drill as in claim 1wherein said coolant is interchangeably supplied through either saidtubular space or said inside of said tubular shank and exhausted throughremaining regress means.
 3. A drill as in claim 1 wherein said coolantis forced through said tubular space or annulus between drill shank andhole and exhausted through said inside of said tubular shank.
 4. A drillas in claim 1 wherein said drill point body means is of integralconstruction.
 5. A drill as in claim 1 wherein said bearing surfacemeans completely surrounds said drill point body means and is circularin configuration to provide full bearing support to said drill when itis in operation.
 6. A drill as in claim 5 wherein said journal meanscomprises a ring of metal fixedly secured to said flank relief portionsof said drill point body means.
 7. A drill as in claim 1 wherein saiddrill body means is chamfered at its base, the chamfer areas extendingfrom the juncture of said point body means with the external diameter ofsaid tubular shank to an area of said flank relief portions adjacentsaid journal means.
 8. A drill as in claim 7 wherein portions of saidchamfered areas are relieved.
 9. A drill as in claim 1 wherein said borein said drill point body means in countersunk at approximately 45* toprovide said open areas to facilitate coolant flow.
 10. A drill as inclaim 9 wherein the end of said tubular shank is countersunk from about12* to 30* from the axis of said shank to further facilitate coolantflow in conjunction with said countersink in said drill point bodymeans.
 11. A drill as in claim 1 including a chisel point on said drillpoint body means, and wherein there are two cutting lips andaccompanying flank relief and lip rake portions on said drill point bodymeans.
 12. A drill as in claim 1 wherein there are at least threecutting lips with accompanying flank relief and lip rake portions onsaid drill point body means and said drill point body means is ofintegral construction.
 13. A drill as in claim 1 wherein said drillpoint body means is integrally constructed of a sintered metal.
 14. Adrill as in claim 1 wherein said drill body means is integrallyconstructed of an oxide metal.
 15. A drill as in claim 1 wherein thedistance from the furthermost point on the cutting end of said drillpoint body means to said relieved open areas adjacent the innermost endof said bore is greater than one-third of the total length of said drillpoint body means.
 16. A drill as in claim 1 wherein said tubular shankhas an outside diameter approximately 40 to 60 percent of the width ofsaid drill point body means.
 17. An improved high speed deep hole drillbody for use with a tubular shank, said drill body comprising a drillpoint body means having a length and width and a bore therein, said boreextending a predetermined distance into said point body means andadapted to receive one end of said tubular shank, said point body meanshaving at least two cutting lips and accompanying flank relief and liprake portions, the arrangement being such that said cutting lips arefully supported by said flank relief portions having relieved sectionsand journal means, said combined journal means having a bearing surfacemeans of greater diameter than the outside diameter of said tubularshank, and adapted to provide bearing support for said drill inoperation, said drill point body means being relieved at the inner endof said bore so as to provide a plurality of open areas between the endof a tubular shank received within said bore and said lip rake portions,said open areas adapted to provide communication between a tubularshank, said cutting lips and the tubular space between the outsidediameter of a tubular shank and the wall of the hole being drilledwhereby coolant may be either forced down said tubular space or theinside of a tubular shank to cool said drill point body means and saidwork and to flush chips produced by said drill out of said hole.
 18. Adrill body as in claim 17 wherein said drill point body means is ofintegral construction.
 19. A drill body as in claim 17 wherein saidbearing surface means completely surrounds said drill point body meansand is circular in configuration to provide full bearing support to saiddrill when it is in operation.
 20. A drill body as in claim 19 whereinsaid journal means comprises a ring of metal fixedly secured to saidflank relief portions of said drill point body means.
 21. A drill bodyas in claim 17 wherein said drill body means is chamfered at its base,the chamfer areas extending from the juncture of said point body meanswith the external diameter of a tubular shank adapted to be receivedtherein to an area of said flank relief portions adjacent said journalmeans.
 22. A drill body as in claim 21 wherein portions of saidchamfered areas are relieved.
 23. A drill body as in claim 17 whereinsaid bore in said drill point body means is countersunk at approximately45* to provide said open areas to facilitate coolant flow.
 24. A drillbody as in claim 17 including a chisel point on said drill point bodymeaNs, and wherein there are two cutting lips and accompanying flankrelief and lip rake portions on said drill point body means.
 25. A drillbody as in claim 17 wherein there are three cutting lips withaccompanying flank relief and lip rake portions on said drill point bodymeans and said drill point body means is of integral construction.
 26. Adrill body as in claim 17 wherein said drill point body means isintegrally constructed of a sintered metal.
 27. A drill body as in claim17 wherein the distance from the furthermost point on the cutting end ofsaid drill point body means to said relieved open areas adjacent theinnermost end of said bore is greater than one-third of the total lengthof said drill point body means.
 28. A drill body as in claim 17 whereinsaid bore has a diameter approximately 40 to 60 percent of the width ofsaid drill point body means.